Question for the Gurus

[motohead_1]

If you thinking about reading whats on a chip maybe you can just jtag it. I dont know if it will read whats going on while its going on but if its static I'm sure it will read the e-prom.

[chri0029]

That's what I'm thinking. I have JTAG'd an old IC years ago (read, erased, and reflashed), but never in this type of application. Truthfully, it's been so long ago that I don't remember much on how to do it, but I will have to read-up on my old notes. It only involves a few pins, so I would think that wouldn't be terribly difficult to solder or hot glue a few wires to the IC board since this is a spare PCM from a junkyard anyway.

[chri0029]

Okay, I was just looking back at my old JTAG notes and it's going to be more difficult than I thought (probably a little over my head). First I connected through a serial or parallel port before. I don't have those anymore and USB is a different animal. Secondly, I used a simple JTAG software program specifically for that application. I am not a programmer, so I don't think I could write one for this specific application. However, the chip data I posted a couple treads ago has some really good info and doesn't seem too difficult. It says the chip actually already contains an embedded erase and program algorithm built into it. That's probably what the board does anyway to enable the chip upon Tech2 program/ reflash command. Again, over my head but probably simple for the gurus. Any thoughts, let me know.